Métodos de avaliação informatizada em prótese fixa

Abstract

ObjectivesThis research work aimed at developing an objective evaluation and classification system of dental preparations, in Fixed Prosthodontics, by means of using PREPassistant®, assessing the influence of two evaluation methods and different evaluators. MethodsAn original model of tooth 15 was used and an instructor model for system calibration was computer designed in CAD. To study the evaluation of dental preparations, two different evaluation methods were developed: a computerized system, the PREPassistant®, and a visual system using computerized images (AVI). In this study, operators contacted for the first time with the tooth preparation technique and, subsequently, executed the preparations to be assessed. The evaluation results were statistically analyzed (Friedman Test and Friedman ANOVA; p≤0.05). ResultsUsing CAD‐designed models for the PREPassistant® system, it was possible to standardize the tooth preparation technique along the axis of the preparation and cervical margin finishing. The analysis of the groups of parameter indicates statistically significant differences between operators and between operators and the PREPassistant® system (p<0.05). ConclusionRegarding the comparison between evaluation methods, we found that the AVI can be used as an alternative method; however, it requires inter‐observer calibration. According to the proposed methodology, the evaluation with PREPassistant® allowed an objective assessment of 83% of the parameters. Subjective evaluation by PREPassistant® (17% of the total evaluation) can be improved with the use of 3D images provided by the system, and increase the accuracy of the system to values higher than 90%.